ARM A STANDING WATCH on a level. kind is one of equity_level, equity_flow (every option sweep or block on SPY, QQQ, IWM or ANY over min_usd of premium -- floor $50,000 -- narrowed by print sweep/block and side call/put; recurring, each fire carries the prints as data), vix_level, crypto_level, crypto_block, prediction_prob (one prediction market's yes probability, in percent, above/below a level; pass market from get_prediction_markets), prediction_level (an event's implied median above/below a number in its own units; pass event) or prediction_whale (a fill over min_usd on one event or ANY on a desk; recurring). Equity and VIX kinds need the full API rung; the $79 Crypto API opens the crypto and prediction kinds and the refusal names which. Give ticker OR coin OR market/event, a level, and a direction (above/below). Evaluated on every publish -- roughly 60s -- and delivered to your registered webhook, signed HMAC-SHA256. Register that webhook over REST first; without one the alert still arms and fires nowhere. Capped per account. Paid.